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Reflect around long axis by default, provide method to choose long/short

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This commit is contained in:
Bryan Housel
2016-12-15 18:13:28 -05:00
parent 94933ac455
commit e88f53ac07
2 changed files with 31 additions and 26 deletions
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56
modules/actions/reflect.js
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@@ -4,11 +4,15 @@ import {
polygonCentroid as d3polygonCentroid
} from 'd3';
import { geoExtent } from '../geo/extent';
import {
geoEuclideanDistance,
geoExtent
} from '../geo';
/* Flip the provided way horizontally. Only operates on "area" ways */
/* Reflect the given area around its axis of symmetry */
export function actionReflect(wayId, projection) {
var useLongAxis = true;
function rotatePolygon(polygon, angle, centroid) {
return polygon.map(function(point) {
@@ -56,7 +60,7 @@ export function actionReflect(wayId, projection) {
}
return function (graph) {
var action = function (graph) {
var targetWay = graph.entity(wayId);
if (!targetWay.isArea()) {
return graph;
@@ -67,30 +71,21 @@ export function actionReflect(wayId, projection) {
var nodes = targetWay.nodes,
p, q;
// choose line pq = axis of symmetry
var angle = ssr.angle * (180 / Math.PI);
if (angle < 0) angle += 180;
var isVertical = (angle > 60 && angle < 120);
// Choose line pq = axis of symmetry
// The shape's surrounding rectangle has 2 axes of symmetry
// By default we reflect across the longer axis.
p1 = [(ssr.poly[0][0] + ssr.poly[1][0]) / 2, (ssr.poly[0][1] + ssr.poly[1][1]) / 2 ];
q1 = [(ssr.poly[2][0] + ssr.poly[3][0]) / 2, (ssr.poly[2][1] + ssr.poly[3][1]) / 2 ];
p2 = [(ssr.poly[3][0] + ssr.poly[4][0]) / 2, (ssr.poly[3][1] + ssr.poly[4][1]) / 2 ];
q2 = [(ssr.poly[1][0] + ssr.poly[2][0]) / 2, (ssr.poly[1][1] + ssr.poly[2][1]) / 2 ];
console.log('angle=' + angle + ', isVertical = ' + isVertical);
if (isVertical) {
p = [
(ssr.poly[0][0] + ssr.poly[1][0]) / 2,
(ssr.poly[0][1] + ssr.poly[1][1]) / 2
];
q = [
(ssr.poly[2][0] + ssr.poly[3][0]) / 2,
(ssr.poly[2][1] + ssr.poly[3][1]) / 2
];
var isLong = (geoEuclideanDistance(p1, q1) > geoEuclideanDistance(p2, q2));
if ((useLongAxis && isLong) || (!useLongAxis && !isLong)) {
p = p1;
q = q1;
} else {
p = [
(ssr.poly[3][0] + ssr.poly[4][0]) / 2,
(ssr.poly[3][1] + ssr.poly[4][1]) / 2
];
q = [
(ssr.poly[1][0] + ssr.poly[2][0]) / 2,
(ssr.poly[1][1] + ssr.poly[2][1]) / 2
];
p = p2;
q = q2;
}
// reflect c across pq
@@ -111,6 +106,15 @@ console.log('angle=' + angle + ', isVertical = ' + isVertical);
}
return graph;
};
action.longAxis = function(_) {
if (!arguments.length) return useLongAxis;
useLongAxis = _;
return action;
};
return action;
}

1
modules/operations/reflect.js
View File

@@ -1,6 +1,7 @@
import { t } from '../util/locale';
import { actionReflect } from '../actions/index';
export function operationReflect(selectedIDs, context) {
var entityId = selectedIDs[0];
var entity = context.entity(entityId);